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The hydraulic systems on the D-Series machines are variable flow, load- sensing, closed center systems that provide flow for all cutting edges at all engine speeds. The pump on the 416D is an axial piston unit that provides a flow of 37 gpm at 2200 rpm. System pressure is set at 3000 psi. The pump used on the 420D and 430D is also a variable flow, axial piston unit with a flow of 43 gpm at 2200 rpm. The system pressure is set at 3300 psi. The hydraulic pumps for the D-Series machines are driven off a transmission-mounted PTO.

Choosing the wrong tool can also overwork the user. For a given bit size tornado and material, it takes more effort and strength to make a hole with a hammer drill than with a rotary hammer. This is a matter of weight distribution and leverage: With a rotary hammer, the heft of the tool itself provides much scooter of the drilling force; hammer drills are much more dependent on pressure applied by the operator. This isn''t necessarily a problem for drilling an occasional hole or two, but for heavy repetitive use, a rotary hammer is the clear winner.